TWI685669B - Radar apparatus and leakage correction method - Google Patents

Abstract

A radar system and a leakage correction method thereof are provided. The radar system includes a transmitter and a receiver. The transmitter includes a sinewave generator. The sinewave generator generate a sinewave signal. The receiver includes another sinewave generator and a correcting circuit. The receiver receives transmitting signals including the sinewave signal from the transmitter. The sinewave generator of the receiver generates another sinewave signal according to the amplitude of the transmitting signals or received transmitting signals. The correcting circuit corrects leakage situation on the received transmitting signals according to another sinewave signal. The phasor of sinewave form corresponding to the leakage situation relates to the phasor of another sinewave signal. Accordingly, the received performance can be improved effectively.

Description

Radar device and its leakage correction method

The invention relates to a radar technology, and in particular to a radar device and a method of correcting leakage.

Radar technology has been developed for many years, and with the rapid development of technology, radar equipment is gradually miniaturized, so that the distance of its internal electronic components may be quite close. In actual operation, due to the small size of the device, the simultaneous reception and transmission of the radar device will cause a finite isolation effect between its receiving and transmitting ends, which will affect the receiving efficiency. The low-IF (Low-Intermediate Frequency, Low-IF) receiving architecture can solve the flicker noise and DC offset in the Zero-Intermediate Frequency (Zero-IF) architecture. ), Local Oscillator (Local Oscillator) leakage, etc., but the smaller the equipment, the more serious the intermediate frequency leakage will be to the in-band interference, thereby forming a blocking signal that reduces the reception performance. In addition, the aforementioned leakage situation may interrupt the signal of the analog-to-digital converter (Analog-to-Digital Converter, ADC), and even using a digital filter cannot solve the aforementioned leakage situation.

The radar device of the embodiment of the present invention includes a transmitter and a receiver. The transmitter includes a sine wave signal generator. The sine wave signal generator is used to generate sine wave signals. The receiver is used to receive the transmission signal from the transmitter including the sine wave signal. The receiver also includes another sine wave signal generator and a correction circuit. The other sine wave signal generator is used to generate another sine wave signal according to the amplitude of the transmitted signal or the amplitude of the transmitted signal after receiving. The correction circuit is coupled to the other sine wave signal generator and used to correct the leakage of the transmitted signal after receiving based on the other sine wave signal. And this leakage situation corresponds to that the phasor in the form of a sine wave (phasor) is related to the phasor of another sine wave signal.

On the other hand, the leak correction method of the embodiment of the present invention is applicable to a radar device. The leak correction method includes the following steps. Generate a sine wave signal. The transmitting signal from the receiving radar device including this sine wave signal. Another sine wave signal is generated according to the amplitude of the transmitted signal or the amplitude of the transmitted signal after reception. Based on this other sine wave signal, the leakage of the transmitted signal after correction is corrected, and this leakage condition corresponds to that the phasor in the form of a sine wave is related to the phasor of the other sine wave signal.

In order to make the above-mentioned features of the present invention more comprehensible, the embodiments are described in detail below and described in detail in conjunction with the accompanying drawings.

Embodiments of the present invention provide a radar device and a leakage correction method thereof, which simulate a leakage situation through a loopback architecture at a receiving end, thereby correcting the leakage situation, thereby improving reception efficiency.

FIG. 1 is a block diagram of components of a radar device 1 according to an embodiment of the invention. Referring to FIG. 1, the radar device 1 includes at least but not limited to the transmitter 100 and the receiver 200. The radar device 1 can be applied to the fields of meteorology, speed measurement, reversing, terrain, military, etc.

的弦波訊號SS1(即，角頻率為

，振幅為2)經

的載波訊號(即，角頻率為

，振幅為1)混波後形成

的DSB-SC訊號。而另一實施例中，弦波訊號SS1亦可乘載資料，例如，展頻編碼（spreading code）。接著，發射器100的天線所發出的發射訊號TS則夾帶經混波處理的弦波訊號SS1。 The transmitter 100 includes at least but not limited to a sine wave signal generator 110, which is used to generate a sine wave signal SS1. In one embodiment, the sine wave signal SS1 may be mixed/mixed via another sine wave carrier signal to form a double side band suppressed carrier (DSB-SC) signal. E.g,

Sine wave signal SS1 (ie, the angular frequency is

, The amplitude is 2)

Carrier signal (ie, the angular frequency is

, The amplitude is 1) formed after mixing

DSB-SC signal. In another embodiment, the sine wave signal SS1 can also carry data, for example, spreading code. Then, the transmission signal TS emitted by the antenna of the transmitter 100 carries the sine wave signal SS1 after being mixed.

The receiver 200 is used to receive the transmission signal TS (for example, transmitted through the antenna of the transmitter 100) transmitted by the transmitter 100, and includes at least but not limited to the sine wave signal generator 210, the control circuit 230 and the correction circuit 250.

The sine wave signal generator 210 is used to generate a sine wave signal SS2. For the description of the sine wave signal SS2, please refer to the previous description for the sine wave signal SS1, which will not be repeated here.

The control circuit 230 may be a chip, a processor, a microcontroller, an application-specific integrated circuit (ASIC), or any type of digital circuit. The control circuit 230 is coupled to the sine wave signal generator 210. The control circuit 230 is used to indicate the phasor (eg, amplitude, angular frequency) of the sine wave signal SS2 generated by the sine wave signal generator 210, and can process the fundamental frequency signal.

The correction circuit 250 may be a summation circuit, a differential amplifier, a subtractor, a programmable gain amplifier, and the like. The correction circuit 250 is coupled to the sine wave signal generator 210 and the control circuit 230. The correction circuit 250 can also receive the sine wave signal SS2 to perform signal summation or subtraction on another signal. Its detailed operation will be described in detail in subsequent embodiments .

In order to facilitate understanding of the operation flow of the embodiment of the present invention, a number of embodiments will be described in detail below to describe the signal processing flow for the radar device 1 in the embodiment of the present invention. Hereinafter, the methods described in the embodiments of the present invention will be described with various components and modules in the radar device 1. The various processes of the method can be adjusted according to the implementation situation, and it is not limited to this.

2 is a flowchart of a leak correction method according to an embodiment of the invention. Referring to FIG. 2, the sine wave signal generator 110 of the transmitter 100 generates a sine wave signal SS1 (step S210 ), and the sine wave signal SS1 can be mixed into a radio frequency signal and transmitted through an antenna. Then, the receiver 200 receives the transmission signal TS transmitted by the transmitter 100 of the radar device 1 through its antenna (step S230) to generate a received transmission signal RTS. The controller 230 determines the signal strength (such as but not limited to the amplitude) of the transmitted signal TS or the transmitted signal RTS after receiving, and sets the sine wave signal SS2 generated by the sine wave signal generator 210 according to the signal strength, so that The sine wave signal generator 210 can generate the sine wave signal SS2 according to the signal strength of the transmitted signal TS or the signal strength of the transmitted signal RTS after receiving (step S250). It is worth noting that after receiving, the transmitted signal RTS will be interfered by the leakage between the transmitter 100 and the receiver 200 (the transmitter 100 and the receiver 200 transmit/receive at the same time), and the transmitted signal TS is based on the sine wave signal SS1 Produced. Therefore, the known signal characteristics of the sine wave signal SS1 (for example, amplitude, phase, In-phase/Quadrate-phase information, etc.) will be used to estimate the leakage at the receiver 200. The control circuit 230 instructs the sine wave signal generator 210 to adjust the output sine wave signal SS2, so that the sine wave signal SS2 approaches or is equivalent to the interference signal of the leakage condition on the same frequency of the transmitted signal RTS after receiving. At this time, the leakage situation corresponds to the phasor in the form of a sine wave and the phasor in the sine wave signal SS2. For example, the two phasors are the same or the difference is less than the allowable threshold. The correction circuit 250 can correct the leakage of the transmitted signal RTS after receiving based on the sine wave signal SS2 (step S270).

The following is a more specific hardware architecture. FIG. 3 is a block diagram of components of a radar device 1'according to an embodiment of the present invention. Referring to FIG. 3, the transmitter 100' of the radar device 1'includes a sine wave signal generator 110', a mixer MIX1, and a radio frequency front-end circuit 170.

The sine wave signal generator 110' includes a phasor generator PG1, a digital-to-analog converter DAC1, and a filter LPF1. In this embodiment, the phasor generator PG1 is an N-order oversampling modulator (N is a positive integer), and the radar device 1'further includes an oscillator OC (coupled to the sine wave signal generator 110') to provide Clock signal CS to phasor generator PG1. The phasor generator PG1 oversamples and modulates the clock signal CS to generate a sine-wave digital signal, and drives the digital-to-analog converter DAC1 to generate an analog sine wave signal SS1. The filter LPF1 performs low-pass filtering on the analog sine wave signal SS1 to form the sine wave signal SS1 finally output by the sine wave signal generator 110'.

The mixer MIX1 is coupled to the sine wave signal generator 110', and the mixer MIX1 mixes (up conversion) the sine wave signal SS1 to form an RF signal, so that the RF signal carries the information of the sine wave signal SS1 . It is worth noting that the carrier signal CRS1 used by the mixer MIX1 for mixing is generated by the frequency synthesizer FSYN based on the clock signal CS.

The RF front-end circuit 170 is coupled to the mixer MIX1, and the RF front-end circuit 170 includes a power amplifier PA and an antenna A1. The power amplifier PA amplifies and outputs the radio frequency signal, and transmits it externally through the antenna A1 (i.e., the transmitted electromagnetic wave carries the transmitted signal TS of the radar device 1').

On the other hand, the receiver 200' includes a sine wave signal generator 210', a control circuit 230, a correction circuit 250, a radio frequency front-end circuit 270, a mixer MIX2, an intermediate frequency amplifier IFA, a filter LPF3, and an analog-to-digital converter ADC.

The sine wave signal generator 210' includes a phasor generator PG2, a digital-to-analog converter DAC2, and a filter LPF2. The operation of the phasor generator PG2, the digital-to-analog converter DAC2, and the filter LPF2 can refer to the foregoing descriptions of the phasor generator PG1, the digital-to-analog converter DAC1, and the filter LPF1, and will not be repeated here. The sine wave signal generator 210' generates the sine wave signal SS2.

It is worth noting that the two-sine wave signal generators 110', 210' of this embodiment generate signals based on the clock signal CS, so the two-sine wave signals SS1, SS2 have the same frequency, but their amplitude and/or phase Information may be different. It should also be noted that, in other embodiments, the phasor generators PG1, PG2 may also be sampled at twice the frequency of the clock signal CS (ie, less than or equal to); or, the phasor generator PG1 , PG2 can also be other circuits that generate sine wave-like digital signals.

The RF front-end circuit 270 includes a low noise amplifier LNA and an antenna A2. The low noise amplifier LNA amplifies the transmission signal TS received by the antenna A2 to generate a transmission signal RTS after reception.

The mixer MIX2 is coupled to the radio frequency front-end circuit 270, and the mixer MIX2 mixes (down-converts) the transmitted signal RTS after receiving to form an intermediate frequency signal IS. It is worth noting that the carrier signal CRS2 used by the mixer MIX2 for mixing is also generated by the frequency synthesizer FSYN based on the clock signal CS (for example, the carrier signal based on the same frequency or a multiple frequency). It can be seen that the carrier signal and the sine wave signals SS1, SS2 have the same clock without further clock correction; however, in other embodiments, considering the design of clock correction, the clock of the aforementioned signal can be generated independently. The invention is not limited.

The intermediate frequency amplifier IFA filters the intermediate frequency signal IS and amplifies the signal of a specific frequency band, (assuming that the correction circuit 250 stops inputting the sine wave signal SS2) and then filters the signal of the desired frequency band through the filter LPF3, and converts it into an analog-to-digital converter ADC The digital signal (fundamental frequency signal) enables the control circuit 230 to obtain the digital signal.

On the other hand, the correction circuit 250 of this embodiment is a summing circuit, and can sum the intermediate frequency signal IS and the inverted sine wave signal SS2 (that is, subtract the sine wave signal SS2 from the intermediate frequency signal IS). It should be noted that the correction circuit 250 of other embodiments may also be disposed before the intermediate frequency amplifier IFA (that is, coupled between the mixer MIX2 and the intermediate frequency amplifier IFA), or after the filter LPF3 (that is, (Coupled between the filter LPF3 and the analog-to-digital converter ADC). The sine wave signal generator 210', the correction circuit 250, the filter LPF3, the analog-to-digital converter ADC and the control circuit 230 form a closed loop structure.

The two methods of correcting the leakage of the receiver 200' will be described below with reference to the devices and components in FIG. FIG. 4 is a flowchart of correcting a leak according to an embodiment of the invention. Referring to FIG. 4, this correction method first determines the initial signal strength of the leak LS between the transmitter 100' and the receiver 200'. The control circuit 230 blocks or suppresses the reception of the sine wave signal SS2 (or sets a switch to stop the output of the sine wave signal generator 210' to the correction circuit 250), so that the control circuit 230 receives the transmitted signal RTS and then down-converts , Filtering, and analog-to-digital conversion of the digital signal, and based on the detection of the signal strength of the transmitted signal RTS after reception (for example, Received Signal Strength Indicator (RSSI), and corresponding to its amplitude) to determine The amplitude of the leak LS2 (step S410). In another embodiment, since the sine wave signal SS1 carried by the transmitted signal TS has a known amplitude, the control circuit 230 can use the known amplitude to evaluate the impact of the transmitted signal RTS on the amplitude of the leaked situation LS after receiving , So as to determine the corresponding amplitude of the leakage situation LS at the same frequency, so there is no need to detect the signal strength of the transmitted signal RTS after reception.

Then, the control circuit 230 blocks or suppresses the reception of the intermediate frequency signal IS (or sets another switch to stop the mixer MIX2 output signal to the correction circuit 250) and turns on the reception of the sine wave signal SS2, so that the control circuit 230 receives the sine wave signal The digital signal of SS2 after filtering and analog-to-digital processing is used to detect the signal strength of the received sine wave signal SS2 (for example, RSSI and corresponding to its amplitude) to determine the initial amplitude of the sine wave signal SS2 (step S430). And the control circuit 230 then instructs the chord wave signal generator 210 'based on an amplitude of the sinusoidal signal SS1 and SS2 amplitude of the sine wave signal is adjusted to not more than the corresponding amplitude leakage LS (step S450), then turned to the intermediate frequency signal IS receive.

After the amplitude of the sine wave signal SS2 is set, the sine wave signal generator 210' adjusts the phase of the sine wave signal SS2 according to the phase corresponding to the leakage condition LS. In one embodiment, the sine wave signal generator 210' changes the phase of the sine wave signal SS2, and corrects the transmitted signal RTS through the SS2 sine wave signal of different phases after receiving through the correction circuit 250, and the control circuit 230 sequentially determines The extent to which the leakage LS decreases in amplitude under the correction of SS2 sine wave signals of different phases. If the corresponding amplitude of the leakage situation LS is corrected by the correction circuit 250 is smaller than the threshold value, the sine wave signal generator 210' can use the phase corresponding to the corrected amplitude smaller than the threshold value as the phase corresponding to the leakage situation LS. For example, the phase corresponding to the smallest amplitude, the second smallest, or the third smallest amplitude after the RTS correction of the transmitted signal after reception is taken as the phase corresponding to the leakage situation LS. At this time, the determined phase will minimize the leakage situation LS (step S470).

Next, the sine wave signal generator 210' may adjust the phase of the sine wave signal SS2 to be the same as the phase corresponding to the leakage situation LS (i.e., the phase determined in step S470). The radar device 1'can start to detect the presence or distance of external objects or objects, and correct the transmitted signal RTS after reception by the correction circuit 250 with the sine wave signal SS2 of the amplitude and phase determined above. At the same time, the control circuit 230 dynamically monitors whether the leakage situation LS changes (for example, the control circuit 230 monitors whether the leakage situation LS changes after a predetermined period of time), and adjusts the amplitude of the sine wave signal SS2 in response to the change in the leakage situation LS (Step S490). For example, in response to the leakage situation where the amplitude corresponding to LS is greater than the threshold value, the sine wave signal generator 210' dynamically adjusts the amplitude of the sine wave signal SS2 (e.g., increasing a specific amplitude or increasing the amplitude according to the current leakage situation LS).

It should be noted that the foregoing description sets the phase of the sine wave signal SS2 to be the same as the phase corresponding to the leakage case LS; however, in other embodiments, the phase of the sine wave signal SS2 may also be set to the phase corresponding to the leakage case LS The phase difference between the phases is less than a certain threshold value.

On the other hand, since the control circuit 230 can obtain the phase/time delay information of the leakage condition LS on the propagation path, the control circuit 230 can use the phase/time delay information as the baseline information and based on The long wavelength of the IF signal determines the phase difference or time delay, and thus determines the position information of external moving or fixed objects.

FIG. 5 is a flowchart of correcting the leakage according to another embodiment of the present invention. Please refer to FIG. 5, this correction method is to first determine the in-phase/quadrature phase information of the leakage situation LS. The control circuit 230 blocks or suppresses the reception of the sine wave signal SS2, so that the control circuit 230 receives the digital signal after the received transmission signal RTS has undergone down-conversion, filtering, and analog to digital processing, and accordingly detects the transmission after reception The in-phase/quadrature phase information of the signal RTS determines the in-phase/quadrature phase information of the leakage situation LS (step S510). The corresponding amplitude of the leakage situation LS is related to the sum of the squares of the same phase and the quadrature phase, and the corresponding phase is related to the arctangent of the division of the same phase and the quadrature phase. In another embodiment, since the sine wave signal SS1 carried by the transmitted signal TS has a known amplitude and phase, the control circuit 230 can estimate the leakage of the transmitted signal RTS after reception by the known amplitude and phase. The influence on the amplitude and phase determines the corresponding amplitude and phase of the leakage situation LS at the same frequency, so there is no need to detect the in-phase/quadrature phase information of the transmitted signal RTS after reception.

Then, the control circuit 230 blocks or suppresses the reception of the intermediate frequency signal IS (or sets another switch to stop the mixer MIX2 output signal to the correction circuit 250) and turns on the reception of the sine wave signal SS2, so that the control circuit 230 receives the sine wave signal The digital signal of SS2 after filtering and analog-to-digital processing is used to detect the in-phase/quadrature phase information of the received sine wave signal SS2, and then adjust the chord according to the in-phase/quadrature phase information of the leakage situation LS Phasor of the wave signal SS2 (step S530). The control circuit 230 is a signal indicative of a chord wave generator 210 'based on the phase of the leakage LS / quadrature-phase information, the amplitude of the sine wave signal SS2 is adjusted to not more than the corresponding amplitude LS leakage, and the sine wave signal SS2, The phase is adjusted to be the same as the phase corresponding to the leakage case LS (or the difference between the two phases is less than the threshold). Next, the control circuit 230 turns on the reception of the intermediate frequency signal IS, and corrects the intermediate frequency signal IS through the correction circuit 250' using the aforementioned sine wave signal SS2 of the set phasor to minimize the leakage LS (step S550). Compared with the embodiment of FIG. 3, the step of switching the different phases of the sine wave signal SS2 to obtain the phase corresponding to the leakage condition LS can be omitted.

Then, when the radar device 1'detects the presence of an external object or object or detects the distance, it can correct the transmitted signal RTS after receiving with the sine wave signal SS2 of the aforementioned set phasor through the correction circuit 250 to remove or reduce leakage Case LS interference. At the same time, the control circuit 230 will dynamically monitor the leakage situation LS and adjust the amplitude of the sine wave signal SS2 in time (step S570). For the detailed operation, please refer to the aforementioned description for step S490.

The foregoing descriptions in FIGS. 3 to 5 are for signal correction at the intermediate frequency (the intermediate frequency signal IS processed by the mixer MIX2), and the present invention can also perform signal correction at the radio frequency. 6 is a block diagram of components of a radar device 1" according to another embodiment of the present invention. Please refer to FIGS. 3 and 6, the difference from the radar device 1" of FIG. 3 is that the correction circuit 250 of the radar device 1" is provided in Between the RF front-end circuit 270 and the mixer MIX2, and the receiver 200" further includes a mixer MIX3, which is coupled to the filter LPF2, the oscillator OC and the correction circuit 250 of the sine wave signal generator 210' . The mixer MIX3 can generate a radio frequency signal RF2 according to the sine wave signal SS2 and the carrier signal CRS2, that is, the mixer signal MRS3 uses the carrier signal CRS2 based on the clock signal CS to mix (upconvert) the sine wave signal SS2.

For the method of correcting the leakage situation of the receiver 200", refer to FIGS. 4 and 5. The difference from the previous description of FIGS. 4 and 5 is that for the receiver 200", the steps S410 and S510 block or suppress the radio frequency signal RF2. The reception of the radio frequency signal RF is received and turned on, and in steps S430 and S530, the reception of the radio frequency signal RF is blocked or suppressed and the reception of the radio frequency signal RF2 is turned on. The transmitted signal RTS of FIG. 3 is the radio frequency signal RF of FIG. 5, and the correction circuit 250 subtracts the radio frequency signal RF2 from the radio frequency signal RF. In this way, the leakage situation LS can be corrected under radio frequency.

In summary, the radar device and the leakage correction method according to the embodiments of the present invention determine the leakage situation based on the transmitted signal or the phasor (eg, amplitude, phase) of the transmitted signal after reception, and accordingly generate the corresponding leakage The sine wave signal of the situation, thus correcting the leakage situation. In this way, the leakage can be effectively eliminated or improved, thereby improving the reception efficiency. Furthermore, the radar device and the leakage correction method according to the embodiments of the present invention provide a loopback architecture at the receiver to first estimate the phasor of the leakage at the same frequency, and then simulate the phasor corresponding to the leakage The sine wave signal of the same frequency can use this sine wave signal to correct the effect of leakage on the transmitted signal after receiving (experimentally it can be improved by more than 30dB). In addition, the clocks of the embodiments of the present invention may be consistent, so that signal correction at intermediate frequency or radio frequency can be achieved. At the same time, the phase and time delay of the overall system can be obtained to evaluate the position information of external objects.

Although the present invention has been disclosed as above with examples, it is not intended to limit the present invention. Any person with ordinary knowledge in the technical field can make some changes and modifications without departing from the spirit and scope of the present invention. The scope of protection of the present invention shall be subject to the scope defined in the appended patent application.

1. 1’, 1”‧‧‧ Radar device 100, 100’‧‧‧ transmitter 110, 110’, 210, 210’‧‧‧sine wave signal generator 170, 270‧‧‧ RF front-end circuit 200, 200’‧‧‧ receiver 230‧‧‧Control circuit 250‧‧‧ correction circuit SS1, SS2‧sine wave signal TS‧‧‧Transmit signal RTS‧‧‧ transmits signal after receiving MIX1, MIX2, MIX3 ‧‧‧ mixer PG1, PG2 ‧‧‧ Phasor generator DAC1, DAC 2‧‧‧Digital to analog converter LPF1, LPF2, LPF3 ‧‧‧ mixer A1, A2‧‧‧ Antenna OC‧‧‧Oscillator CS‧‧‧clock signal CRS1, CRS2 ‧‧‧ carrier signal FSYN‧‧‧frequency synthesizer IFA‧‧‧IF amplifier ADC‧‧‧Analog to Digital Converter LS‧‧‧Leakage N‧‧‧ Order IS‧‧‧IF signal RF, RF2‧‧‧RF signal S210~S270, S410~S490, S510~S570

FIG. 1 is a block diagram of components of a radar device according to an embodiment of the invention. 2 is a flowchart of a leak correction method according to an embodiment of the invention. 3 is a block diagram of components of a radar device according to an embodiment of the invention. FIG. 4 is a flowchart of correcting a leak according to an embodiment of the invention. 5 is a flowchart of a leak correction method according to another embodiment of the present invention. 6 is a block diagram of components of a radar device according to another embodiment of the invention.

S210~S270‧‧‧Step

Claims (21)

A radar device includes: a transmitter, including: a first sine wave signal generator for generating a first sine wave signal; and a receiver for receiving the transmission signal sent by the transmitter, wherein the The transmitted signal includes the first sine wave signal, and the receiver includes: a second sine wave signal generator for generating a second sine wave signal according to the amplitude of the transmitted signal or the amplitude of the transmitted signal after receiving; and A correction circuit, coupled to the second sine wave signal generator, and used to correct the leakage condition of the transmitted signal after receiving based on the second sine wave signal, wherein the leakage condition corresponds to a phasor in the form of a sine wave (phasor) is related to the phasor of the second sine wave signal. The radar device as described in item 1 of the patent application scope, wherein the second sine wave signal generator adjusts the amplitude of the second sine wave signal to be not greater than that corresponding to the leakage condition based on the amplitude of the first sine wave signal amplitude. The radar device as described in item 1 of the patent application scope, wherein the second sine wave signal generator adjusts the phase of the second sine wave signal according to the phase corresponding to the leakage condition. The radar device as described in item 3 of the patent application range, wherein the second sine wave signal generator adjusts the phase of the second sine wave signal to be the same as the phase corresponding to the leakage situation. The radar device as described in item 4 of the patent application, wherein the second sine wave signal generator changes the phase of the second sine wave signal, and the amplitude corresponding to the leakage condition is based on the signal strength of the transmitted signal after receiving, And the correction circuit corrects the received transmitted signal through the second sine wave signals of different phases, and the second sine wave signal generator corrects the leakage situation after the correction circuit corrects the corresponding amplitude to be less than a threshold The corresponding phase is taken as the phase corresponding to the leakage situation. The radar device as described in item 3 of the patent application scope, wherein the receiver includes: a control circuit, coupled to the second sine wave signal generator, and used to determine the in-phase of the transmitted signal after receiving )/Quadrate-phase information to determine the amplitude and phase corresponding to the leak. The radar device as described in item 1 of the patent application scope further includes: an oscillator coupled to the first sine wave generator and the second sine wave generator, and used to provide a clock signal to the first sine wave Generator and the second sine wave generator, wherein the first sine wave generator generates the first sine wave signal according to the clock signal, and the second sine wave generator generates the second sine wave according to the clock signal Wave signal. The radar device as described in item 1 of the patent application scope, wherein one of the first sine wave signal generator and the second sine wave signal generator includes: a phasor generator for generating a digital signal; A digital-to-analog converter, coupled to the phasor generator, and used to convert the digital signal into an analog signal; and a filter, coupled to the digital-to-analog converter, and used to filter the analog signal to generate the One of the first sine wave signal and the second sine wave signal. The radar device as described in item 8 of the patent application scope, wherein the phasor generator is an oversampling modulator. The radar device as described in item 8 of the patent application scope further includes: a radio frequency front-end circuit for receiving the transmitted signal to generate the transmitted signal after receiving; a first mixer coupled to the radio frequency front-end circuit, And used to generate an intermediate frequency signal according to the received transmitted signal; and an intermediate frequency amplifier circuit, coupled to the first mixer and the correction circuit, and used to receive the intermediate frequency signal, wherein the correction circuit is connected to the The intermediate frequency signal processed by the intermediate frequency amplification circuit minus the second sine wave signal. The radar device as described in item 8 of the patent application scope, wherein the transmitted signal after reception is a radio frequency signal, and the receiver further includes: a second mixer, coupled to the filter, and used to The second sine wave signal and a carrier signal generate a second radio frequency signal, and the radar device further includes: a radio frequency front-end circuit, coupled to the correction circuit, and used to receive the transmitted signal to generate the radio frequency signal, wherein the correction circuit is The radio frequency signal minus the second radio frequency signal. As in the radar device described in item 1 of the patent application, wherein the amplitude corresponding to the leakage condition is greater than a threshold, the second sine wave signal generator dynamically adjusts the amplitude of the second sine wave signal. The radar device as described in item 1 of the patent application, wherein the receiver includes: a control circuit, coupled to the second sine wave signal generator, and used to determine the position information of an external object according to the phase corresponding to the leakage . A leakage correction method is suitable for a radar device, and the leakage correction method includes: generating a first sine wave signal; receiving a transmission signal sent by the radar device, wherein the transmission signal includes the first sine wave signal; according to the The amplitude of the transmitted signal or the amplitude of the transmitted signal after receiving generates a second sine wave signal; and based on the second sine wave signal to correct the leakage of the transmitted signal after receiving, wherein the leakage corresponds to the form of a sine wave The phasor is related to the phasor of the second sine wave signal. The leakage correction method according to item 14 of the patent application scope, wherein the step of generating the second sine wave signal according to the amplitude of the transmitted signal comprises: based on the amplitude of the first sine wave signal, the step of generating the second sine wave signal The amplitude of is adjusted to be no greater than the amplitude corresponding to the leakage situation. The leakage correction method as described in item 14 of the patent application, wherein the step of generating the second sine wave signal according to the amplitude of the transmitted signal after receiving further comprises: adjusting the second sine wave according to the phase corresponding to the leakage situation The phase of the signal. The leakage correction method as described in Item 16 of the patent application scope, wherein the step of adjusting the phase of the second sine wave signal according to the phase corresponding to the leakage condition further includes: changing the phase of the second sine wave signal, wherein the leakage The amplitude corresponding to the situation is based on the signal strength of the transmitted signal after receiving; the second transmitted sine wave signal with different phases is corrected for the transmitted signal after receiving; and the corresponding amplitude after the leakage situation is corrected is less than a threshold The corresponding phase is taken as the phase corresponding to the leakage situation. The leakage correction method as described in Item 16 of the patent application scope, wherein the step of adjusting the phase of the second sine wave signal according to the phase corresponding to the leakage situation further includes: determining the in-phase/quadrature of the transmitted signal after receiving Phase information to determine the corresponding amplitude and phase of the leak. The leakage correction method as described in item 14 of the patent application scope, wherein the step of correcting the leakage of the transmitted signal after receiving based on the second sine wave signal includes: generating an intermediate frequency signal based on the transmitted signal after receiving; and The second sine wave signal is subtracted from the intermediate frequency signal. The leakage correction method as described in item 14 of the patent application scope, wherein the received transmission signal is a radio frequency signal, and the step of correcting the leakage of the received transmission signal based on the second sine wave signal includes: The second sine wave signal and a carrier signal generate a second radio frequency signal; and subtract the second radio frequency signal from the radio frequency signal. The leakage correction method as described in item 14 of the patent application scope, wherein after the step of correcting the leakage condition of the transmitted signal after receiving based on the second sine wave signal, the method further includes: the amplitude corresponding to the leakage condition is greater than a threshold Value, the amplitude of the second sine wave signal is dynamically adjusted.

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